Mustard gas used in WW1
Mustard gas was invented as a weapon that would instill confusion and panic among the enemy prior to an attack
Lachrymator (tearing agent)
Much like today's tear gas and mace, this gas caused temporary blindness and greatly inflamed the nose and throat of the victim. A gas mask offered very good protection from this type of gas. xylyl bromide was a popular tearing agent since it was easily brewed.
Asphyxiant
These are the poisonous gases. This class includes chlorine, phosgene and diphosgene. Chlorine inflicts damage by forming hydrochloric acid when coming in contact with moisture such as found in the lungs and eyes. It is lethal at a mix of 1:5000 (gas/air) whereas phosgene is deadly at 1:10,000 (gas/air) - twice as toxic! Diphosgene, first used by the Germans at Verdun on 22-Jun-1916, was deadlier still and could not be effectively filtered by standard issue gas masks.
Chlorine gas destroyed the respiratory organs of its victims and this led to a slow death by asphyxiation.Blistering Agent (Mustard Gas)
Dichlorethylsulphide: the most dreaded of all chemical weapons in World War I - mustard gas. Unlike the other gases which attack the respiratory system, this gas acts on any exposed, moist skin. This includes, but is not limited to, the eyes, lungs, armpits and groin. A gas mask could offer very little protection. The oily agent would produce large burn-like blisters wherever it came in contact with skin. It also had a nasty way of hanging about in low areas for hours, even days, after being dispersed. A soldier jumping into a shell crater to seek cover could find himself blinded, with skin blistering and lungs bleeding.
Mustard gas used in WW1
Mustard gas was invented as a weapon that would instill confusion and panic among the enemy prior to an attack
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